Lock



May 25', 1926.

N; M. STONE Loox Filed Jan. 18, 19265 Fatented May 25, 1926. i i A* unirensrares eerste-r errice.

NATHAN 1yr. STONE, OF CHICAGO, ILLINOIS.

` LOCK.

Application led January 18, 1926. Serial- No. 81,881.

This invention relates to locks, and its are struck up from the back case member principalobject is to provide a simple and and are adapted to be thrust through the inexpensive, yet practical and effective lock. wall of the Object upon which the lock is` The invention relates, more particularly, to used and bent down on it to secure the lock 5 that type of lock adapted for locking the thereto. The Vcase contains the Operative C- lid or cover to a box, case, cabinet or the parts of the lock and certain of its marginalV like. Another Object is to reduce, to a miniwalls act as guides for guiding the openu mum, the number of parts composing the Yative'. partsk in their movements in the case. n lock. Another object is to provide a lock of The operative parts ofthe lock comprise which the several parts may be formed of a slidablelock plate 20, a slidable tumbler 00 metal stampings. Other objects and ad- 2l and a U spring 22 carried bythe tumbler vantages-will appear in the course of this vand interposed between the lock plate and specification, and with said objects and adtumbler. A button 24 having a shouldered Vantages in view, this Yinvention consists in DeCk 25 GXGIldl/lg through a slot` 26 inthe the several novel features of construction front wall l5 of the case and secured in a 6.5 and arrangement of parts, hereinafter fully hole in the lock plate 20, furnishes means described and claimed, for retracting the lock plate from its locked The invention is clearly illustrated in the position, and a key 27 (see F ig..4), capable yaccompanying drawings, in which: of being inserted through a keyhole slot 28 Fig. l is a front elevation of a lock em in the front wall of the case, furnishes 70 bodying a simple form ofthe present invenmeans for actuating the tumbler inv locking tion; Fig. V2 is a rear elevation thereof; and unlocking the lock plate. A hook mem- Fig. 3 is a rear elevation with the side ber 29 secured to the lid or cover of the. ia'nges of the back member of the case object to which the lock is applied, is v shown insection; Fig. 4 is a View similar to arranged to enter through a slotl 30 in the 75 Fig, 3, but Showing the pari-,S in locked positop flange of the front case member and tion; Fig. 5 is a plan of the look with the lockingly engage with the 100k plat@ 20- hook member removed; Fig. 6 is a horizon- The lock plate 2O preferably comprises a tal section taken on the line 6-6 of Fig. 4 metal stamping, struck up by suitable dies l 30 and Fig. 7 is a vertical section takenon the from sheet metal, and is, roughly speaking, 50 line 7 7 of Fig. 3V and showing the lock generally rectangular in shape. Its upper applied to a box. AFigs. 3 to 7 inclusive, edge bears against the underside of the top are upon an enlarged scale. fiange of the front case member, and said Referring to said drawing, the reference edge 'is held in engagement with said flange character A designates a boX or cabinet and by the neck 25 of the button 24 which Vis S5 B the lid thereof to which the lock is ap- 'confined in the slot 26. A wide notch 3l isA plied. The character l0,V designates the case formed in the upper `half of the lock plate of the lock, which may be rectangular in for thereception of the hook of the hook form, comprising the front case member 1l member 29 and said notch is so shaped as 10 and the back case member 12. The front to leave a hook 32 on the lock plate, that 90 case member Ais formed with a marginal lockingly engages said hook member 29 flange 1,3 and the back case member is when in operative position. formed with side flanges 14 that fit between At one side of the hook 32 the lock plate the side flanges of the front case member 'isformed with an`arm 33 which projects 5 and bear against the front walll 0f said beyondv the side edge 34 of thev lock plate, 95

front lcase member. Tongues 16v are struck and said side edge 34 is formed, between its up at theedges of the flanges of the 'front ends, with a rounded lug 85 against which Y case member and are bent over behind the one endet therU spring 22 is adapted to back wall 17 of the back case member and bear, i The tension or the sprint@ is exerted secure said members together. Tongues 1S to yieldingly hold the leale plete m the posifa tion seen in full lines in Figs. 3 and 4, although permitting the lock plate to be moved over into the position indicated by the dotted lines in Fig. 3, to thereby release the hook member 29 from it. When the tumbler is in the position seen in Fig. 3 the lock plate is free to move back and forth, in a line lengthwise of itself.

The tumbler 2l, .is also a metal stamping somewhat L shaped in form, having a vertical arm 36 which bears against a side flange of the back case member and a horizontal arm 37 that projects from the vertical arm 36 toward the middle of the case. The U spring stands in the angle, formed between the arms 36, 37 and lone arm 38 of the spring extends up trom its U bend and engages with a lug 39 toi-med on the arm 3G of the tumbler. The other arm 40 of the U spring is bent up to form a rounded end 4l Vwhich engages the edge 34 oi' the lock plate, and when the parts are in the positions seen in Fig. 3 said rounded end of the spring engages the under side ot' the lug 35, thereby yieldingly holding the tumbler in its unlocked position as seen in F ig. 8, and thereby permitting the lock plate to be retracted. It is to be observed that the upper end portion 42 of the vertical arm 36 of the tumbler is located below the path of movement taken by the projecting arm 33 of the lock plate,- when the tumbler is in unlocked position, thereby permitting free movement ot' the lock plate, but that when the tumbler is moved into its raised or locked position (see Fig. 4) said end portion 42 stands in the path ot movement of the projecting arm of the lock plate and effectively prevents movement thereof in the direction to release Vthe hook member 29. It will also be observed that the U spring is secured between the upper curved edge 43 of the horizontal arm 37 of the tumbler and the lower edge ot the lug 39 of the tumbler, and moves with the tumbler, and that when the tumbler is moved into its raised or locked position, the rounded end 41 ot the arm 40 of the U spring is engaged with the upper edge ot the lug 35, thereby holding the tumbler in its raised or locked position. The one and the same spring, therefore, acts to yieldingly hold the look plate in its operative position for engagement with the hook member 29, and holds thel tumbler in sliding engagementwith the side flange oit' the case, and yieldingly holds the tumbler in its lower or unlocked position andin its raised or locked position.

The endv of th-e horizontal arm 3i' ot the tumbler is iormed with a notch 44 in which the key 27 may engage to raise or lower the tumbler.

The operation of the lock is readily apparent from the above description. When the key is inserted in the keyhole and turned in the direction to lock the lock, the key engages with the upper edge ot the notch 44 in the tumbler and raises the latter into the position seen in Fig. 4, wherein the end portion 42 of the vertical arm ot the tumbler takes a position obstructing movement ot the lock plate. In approaching this position the rounded end 4l of the U spring has passed over the lug 35 and has become engaged aga-inst its upper edge, thereby preventing the tumbler from being lowered eX- cept when moved by a proper key. In this position of the parts, the lock plate cannot be manipulated. To unlock the lock the key is inserted in the keyhole and turned in the direction to lower the tumbler and it then engages with the lower edge of the slot 44 thereby moving the tumbler down, out of the way of the projecting arm 33 of the lock plate, and the spring is therewith moved down by the lug 39 to the position where it engages with the underside of the lug 35, and prevents the tumbler from being accidentally moved upward.

I claim as new, and desire to secure by Letters Patent:

l. A lock, comprising a case, having top, bottom and side walls, a slidable lock plate guided by the top wall of the case, a slidable L shaped tumbler guided by a side wall ot the case, and a U shaped spring carried by, and moving with, said tumbler and interposed between said lock plate and tumbler, said lock plate having a lug, co-operating with one arm of said spring to yieldingly hold the tumbler in its locked and unlocked positions.

2. .A lock comprising a case, having top, bottom and sid-e walls, a slidable lock plate guided by the top wall. a slidable L shaped tumbler guided by a side wall of the case, and a U shaped spring interposed between the lock plate and tumbler, said lock plate having a hook for engagement with a complemental hook member, a projection adapted for engagement with the tumbler and a lug adapted for engagement with the spring, and the tumbler having the end portion ol* one ot its arms adapted for engagement with the projection of the lock plate, said tumbler having a lug formed on said arm arranged to engage with the spring and hold it between the lug and its other arm, and said spring having a rounded end arranged to engage, alternately, with the under and upper side oi the lug on the lock plate, to thereby yieldingly hold said tumbler in its raised and lowered positions.

3. A lock comprising a case, having top, bottom and side walls, a slidable lock'plate guided by the top wall ot' the case, and formed with a tumbler engaging arm, at one end, and with a spring engaging luv on one edge, a slidable L shaped tumbler, guided by a side wall of the case and movable translll lll

versely of the leek plate, said tumbler having a lock plate engaging end and a spring engaging lug, and a U spring, held jbetween said spring engaging lug of the tumbler and an arm of said tumbler, and moving With said tumbler, Said spring having a bent up end engaging with the edge of said look `spring acting to yieldingly hold the lock 10 plate in locked position, and to hold the tumbler in its locked and unlocked positions.

NATHAN M. STONE.- 

